Ringworm Nhs When the cause of the red dots is broken blood vessels under the skin, it is medically termed petechia Petechia is easily distinguishable from erythema (redness of the skin) by applying pressure onto the area If there blanching with pressure, then it is most likely erythema Possible Causes of Pinpoint Red Dots on Skin 1 Cherry Angiomas An allergic reaction of the skin or the immune system to drug, food and cosmetic products is a common cause of small red dots on skin This can be on the face, hands, legs, or all over the body The spots can be spread or clustered Allergic reactions to food and medicine are considered serious, they can be life threatening Ring of red dots on skin